Electric fuse



y 1942- H. BEYER 2,282,849

ELECTRIC FUSE Filed Sept; 16, 1940 FIG.3. FIG.4.

- INVENTOR.

ATTORNEY.

Patented May 12, 1942 UNITED STATES PATENT OFFICE ELECTRIC ruse HaimBeyer, Plainiield, N. 1., assignor to Cornell- Dubiller ElectricCorporation, South Plainiield, N. 1., a corporation of DelawareApplication September 16, 1940, Serial No. 356,989

4 Claims Other objects will become apparent from the followingdescription taken with reference to the accompanying drawing formingpart of thisthrough a fuse embodying the principles of the invention,

Figure 2 is a cross-sectional view taken on line 2--2 of Figure 1,

Figure 3 is a cross-sectional view taken on line 3-3 of Figure 1,

Figure 4 is a longitudinal cross-section of a modified fuse constructionaccording to the invention,

Figure 5 is an isometric view showing the outer appearance of the fuseaccording to the previous figures.

Referring to the drawing wherein like reference numerals identify likeparts in the different views, there is shown in Figures 1 to 3 a fusecomprising a support or baseplate III of ceramic or other suitableinsulating material aboutthe opposite end of which are placed contactingmetal strips H and H bent in U-fashion to engage the opposite faces ofthe plate in the manner shown. An easily fusible element I! such as awire or strip is placed upon the plate ID with its opposite endsengaging the metal strips H and II. A second insulating plate I: similarto the plate ill overlies the latter and the entire assembly is firmlyheld together by means of a pair of metal clamp elements I4 and M whichare in electrical connection with the ends of the fusible element I!through the contacting strips H and II. Integral with or connected inany suitable manner to the clamp elements l4 and H are a pair ofterminal elements l5 and r ctively, such as flexible wire leads ortermina elements of any other suitable construction. The entire fusestructure, after assembly in the manner shown is enclosed andhermetically sealed by a casing It of fusible artificial resin such asof the phenol-formaldehyde, urea-formaldehyde or any other suitabletype,

to completely protect the fuse element against air and moisture andother foreign agents and to eliminate fire hazard when the strip or wireI! is burned or fused by an excessive load current passing the fuse.

Referring to Figure 4 there is shown a simplified constructioncomprising a single insulating plate 10 with a fusible element such as astrip or wire II having its opposite ends reversely bent around the endsof the plate and a pair of terminal-clamps I4 and H engaging theassembled elements in a manner similar to that shown in the precedingfigures.

Further modifications and variations of the structure shown anddescribed for illustration will readily suggest themselves to thoseskilled in the art and the specification and claims presented areaccordingly to be regarded in an illustrative rather than a limitingsense short of the scope of the invention as defined in the appendedclaims.

I claim:

1. An electric fuse comprising an elongated fusible element, aninsulating support for said element, a pair of metal clamp elementsengaging the opposite ends of said support and being in electricalcontact with the adjacent ends of said fusible element, a casing offixable artificial resin enclosing and hermetically sealing theassembied elements, and terminal means passing from said clamp elementsto the outside of said casing.

2. An electric fuse comprising a pair of insulating plates, an elongatedfusible element placed between said plates, metallic strips engaging theends of said fusible element and being reversely bent upon one face ofsaid plates, a pair of metal clamp elements pressed around the oppositeends of said plates and engaging the bent portion of said metal strips,a casting of fixable artificial resin enclosing and hermetricallysealing the assembled elements, and terminal means passing.

from said clamp elements to the outside of said casing.

3. An electric fuse comprising a pair of superposed insulating plates,an elongated fusible element placed between said plates, terminal clampelements pressed around the opposite ends of said plates, contactingmetal strips in electrical contact with the opposite ends of saidfusible element and the adjacent metal clamps, a casing of fixableartificial resin enclosing and hermetically sealing the assembledelements, and terminal means passing from said clamp elements to theoutside of said casing.

4. An electric fuse comprising a pair of superposed insulating plates, afusible metal strip placed between said plates, a pair or terminal clampelements pressed around opposite ends oi said plates, contacting metalstrips having one end clamped between said fusible strip and theadjacent insulating plate, and having their other meme-1a ends clampedbetween the adjacent metal clamp and one of said insulating plates, acasing of ilxabie artificial resin enclosin: and hermetical- 1y sealingthe assembled elements, and terminal means passing from said clampelements to the outside of said casing.

HARE BEYER.

